Understanding Docker Multi-Stage Builds | How to reduce the size of your Docker Image
Agenda:
How to reduce the size of Docker Image?
How to create an efficient Docker Image?
Understanding Docker Multi-Stage Builds
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What is a dockerfile?
Docker can build images automatically by reading the instructions from a Dockerfile.
A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.
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Dockerfile Directives
FROM Starts a new build stage and sets the base image.
ENV: Set environment variables. These can be referenced in the Dockerfile itself and are visible to the container at runtime.
COPY adds files from your Docker client’s current directory.
RUN Creates a new layer on top of the previous layer by running a command inside that new layer.
CMD specifies what command to run within the container.
WORKDIR Sets the current working directory inside the container.
ADD Similar to COPY, but can also pull files using a URL and extract an achieve into loose files in the image.
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Use multi-stage builds
Multi-stage builds are a new feature requiring Docker 17.05 or higher on the daemon and client.
Multistage builds are useful to anyone who has struggled to optimize Dockerfiles while keeping them easy to read and maintain.
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As a prerequisite, you need to have docker installed.
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What is Dockerfile | Understanding Dockerfile Directives | How to Build an Image using Dockerfile :
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